Preparation method of titanium dioxide nano-tube-array photo-electrode used for removing organic pollutant

A technology of nanotube arrays and organic pollutants, applied in water pollutants, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problem of high recombination rate of titanium dioxide photogenerated electrons and holes, affecting photocatalytic efficiency, and solar energy utilization Low efficiency and other problems, achieve good removal effect, improve photocatalytic activity, and avoid the use of toxic substances

Active Publication Date: 2013-09-25
山东评测环境科学研究院有限公司
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  • Abstract
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Problems solved by technology

[0004] However, due to TiO 2 The band gap is wide and can only be excited by ultraviolet light with a wavelength of less than 400nm, so the utilization rate of solar energy is low, which limits its application range, and the recombination rate of photogenerated electrons and holes in the intrinsic state of titanium dioxide is relatively high, which also affects the light. Improvement of catalytic efficiency

Method used

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  • Preparation method of titanium dioxide nano-tube-array photo-electrode used for removing organic pollutant
  • Preparation method of titanium dioxide nano-tube-array photo-electrode used for removing organic pollutant
  • Preparation method of titanium dioxide nano-tube-array photo-electrode used for removing organic pollutant

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Embodiment 1

[0025] Such as figure 1 , 2 , 3, 4, and 5 show a method for preparing a titanium dioxide nanotube array photoelectrode for removing organic pollutants, the steps comprising:

[0026] 1) Cut tungsten-containing titanium sheets (tungsten90%) into strip-shaped foils of 100×10×0.2mm, clean them with decontamination powder, hydrofluoric acid, 1000-mesh sandpaper, 2000-mesh sandpaper Grinding and polishing, ultrasonic cleaning in acetone, ethanol and deionized water for 5 minutes;

[0027] 2) Using the tungsten-containing titanium sheet pretreated in 1) as the raw material, the tungsten trioxide and titanium dioxide nanotube arrays were prepared in situ by a one-step constant current and constant voltage anodic oxidation method, and the electrolyte was 0.5% NaF and 1.0M Na 2 SO 4 Mixed solution, the temperature is 25°C, the voltage is 20V, and the initial current is set to 0.005mA / cm 2 , oxidized for 2 hours, in situ generating nanotube arrays on the surface of tungsten-containi...

Embodiment 2

[0033] 1) Cut tungsten-containing titanium sheets (tungsten90%) into strip-shaped foils of 100×10×0.2mm, clean them with decontamination powder, hydrofluoric acid, 1000-mesh sandpaper, 2000-mesh sandpaper Grinding and polishing, ultrasonic cleaning in acetone, ethanol and deionized water for 5 min respectively.

[0034] 2) Using the tungsten-containing titanium sheet pretreated in 1) as the substrate, the tungsten trioxide-titanium dioxide nanotube array was prepared in situ by a one-step constant current and constant voltage anodization method, and the electrolyte was 0.4% NaF and 0.5M Na 2 SO 4 Mixed solution, the temperature is 25°C, the voltage is 20V, and the initial current is set to 0.004mA / cm 2 , oxidized for 2h, in situ generating nanotube arrays on the surface of tungsten-containing titanium sheet.

[0035] 3) The nanotube array prepared in step 2) was calcined at 450° C. for 2 hours, cooled in the furnace and then used for later use.

[0036] 4) With graphite pow...

Embodiment 3

[0041] 1) Cut tungsten-containing titanium sheets (tungsten90%) into strip-shaped foils of 100×10×0.2mm, and then clean them with decontamination powder, hydrofluoric acid, 1000-mesh sandpaper, and 2000-mesh sandpaper Grinding and polishing, ultrasonic cleaning in acetone, ethanol and deionized water for 5 min respectively.

[0042] 2) With the tungsten-containing titanium sheet pretreated in 1) as the substrate, the tungsten trioxide-titanium dioxide nanotube array was prepared in situ by a one-step constant current and constant voltage anodization method, and the electrolyte was 0.5% NaF and 0.8M Na 2 SO 4 Mixed solution, the temperature is 25°C, the voltage is 20V, and the initial current is set to 0.002mA / cm 2 , oxidized for 2h, in situ generating nanotube arrays on the surface of tungsten-containing titanium sheet.

[0043] 3) The nanotube array prepared in step 2) was calcined at 750° C. for 2 hours, cooled in the furnace and then used for later use.

[0044] 4) With ...

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Abstract

The invention discloses a preparation method of a titanium dioxide nano-tube-array photo-electrode used for removing organic pollutant. The method comprises five steps. A tungsten trioxide-titanium dioxide nano-tube array is prepared by using a tungsten-titanium sheet with a one-step constant-current constant-voltage anodization method. Graphene modification is carried out with an absorption reduction method. The preparation method is simple and safe. Reaction is fast, and is easy to control. The application of toxic substances is avoided, such that the method is green and environment-friendly. The prepared nano-tubes have regular and ordered morphology, and are non-toxic and stable. Compared with a pure titanium dioxide nano-tube array, photo-catalytic activity of the nano-tube array provided by the invention under visible light is greatly improved. Under sunlight irradiation, the photo-electrode provided by the invention can be used for carrying out photo-catalytic treatment upon wastewater comprising dyes, nonylphenol and alachlor, and good removal effect can be provided.

Description

technical field [0001] The invention relates to a method for preparing a titanium dioxide nanotube array photoelectrode for removing organic pollutants, and belongs to the field of composite photoelectrode preparation. Background technique [0002] The discharge of organic wastewater has caused very serious environmental pollution and a huge threat to human health. Because it contains toxic, harmful, and refractory organic pollutants, my country's traditional water treatment processes cannot completely remove it from the water environment. In recent years, my country has made great progress in the treatment of organic wastewater by resin method. Resins with selective adsorption and easy regeneration have been synthesized and applied in the field of environmental protection. At the same time, advanced oxidation technology, as a technology for selectively degrading organic matter in sewage, has attracted more and more attention. [0003] Titanium dioxide nanotube array photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26C25D9/08C02F1/30C02F1/72C02F101/30
CPCY02W10/37
Inventor 辛言君刘永萍马东吴娟崔春月
Owner 山东评测环境科学研究院有限公司
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